Pyrochlore Oxide Superconductor Cd2Re2O7 Revisited
Pyrochlore Oxide Superconductor Cd2Re2O7 Revisited
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DOI：
10.7566/jpsj.87.024702
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发表时间：
2018-02-15
影响因子：
1.7
通讯作者：
Hirai, Daigorou
中科院分区：
文献类型：
--
作者：
Hiroi, Zenji;Yamaura, Jun-ichi;Hirai, Daigorou
重新审视超导烧绿石氧化物 Cd2Re2O7，特别强调样品质量问题。该化合物自 2001 年被发现以来，作为 α-烧绿石氧化物家族中唯一的超导体（T-c = 1.0 K）而引起人们的关注。此外，它表现出立方烧绿石结构的两个特征结构转变，其中第一个反演对称性在 200 K 时破缺。最近，它作为候选自旋轨道耦合金属而受到越来越多的关注。 （SOCM），其中特定的费米液体不稳定性预计会导致奇宇称序与自发反演对称破缺[L.傅，物理。莱特牧师。 115, 026401 (2015)] 和宇称混合超导性 [V. Kozii 和 L. Fu，物理学家。莱特牧师。 115、207002（2015）； Y. Wang 等人，物理学。修订版 B 93, 134512 (2016)]。我们根据 SOCM 的理论预测回顾了我们之前的实验结果，并与其他小组的实验结果进行了比较，我们认为这对于理解这种独特化合物的未来进展有意义且有帮助。
The superconducting pyrochlore oxide Cd2Re2O7 is revisited with a particular emphasis on the sample-quality issue. The compound has drawn attention as the only superconductor (T-c = 1.0 K) that has been found in the family of alpha-pyrochlore oxides since its discovery in 2001. Moreover, it exhibits two characteristic structural transitions from the cubic pyrochlore structure, with the inversion symmetry broken at the first one at 200 K. Recently, it has attracted increasing attention as a candidate spin-orbit coupled metal (SOCM), in which specific Fermi liquid instability is expected to lead to an odd-parity order with spontaneous inversion-symmetry breaking [L. Fu, Phys. Rev. Lett. 115, 026401 (2015)] and parity-mixing superconductivity [V. Kozii and L. Fu, Phys. Rev. Lett. 115, 207002 (2015); Y. Wang et al., Phys. Rev. B 93, 134512 (2016)]. We review our previous experimental results in comparison with those of other groups in the light of the theoretical prediction of the SOCM, which we consider meaningful and helpful for future progress in understanding this unique compound.